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United States Patent |
5,194,289
|
Butland
|
March 16, 1993
|
Method for labeling an object for its verification
Abstract
Disclosed is a method for labeling an object for its identification. The
method comprises applying a selected person's fingerprint to said object
at a predetermined location upon said object. Next, the predetermined
location is exposed to a vaporous agent comprising vapors of a
cyanoacrylate ester. The selected person's fingerprint or said vapors of
cyanoacrylate ester bear a detectable amount of an ultra-violet radiation
sensitive dye. Exposing the predetermined location to said vapors create a
permanent impression of the fingerprint on the object which impression is
perceptible only in the presence of UV radiation. Prime objects for
identification in accordance with the method of the present invention
include works of art, negotiable instruments, credit card receipts, and
like objects.
Inventors:
|
Butland; Charles L. (Playa del Rey, CA)
|
Assignee:
|
Butland Trust Organization (Los Angeles, CA)
|
Appl. No.:
|
597859 |
Filed:
|
October 15, 1990 |
Current U.S. Class: |
427/1; 427/7; 427/145; 427/160 |
Intern'l Class: |
B05D 005/00; A61B 005/117 |
Field of Search: |
427/1,7,255.6,145,160
|
References Cited
U.S. Patent Documents
1374208 | Apr., 1921 | Jones | 427/7.
|
2066535 | Jan., 1937 | Lucas | 427/7.
|
Foreign Patent Documents |
2551814 | May., 1977 | DE | 427/7.
|
3151012 | Jul., 1983 | DE | 427/7.
|
1456784 | Oct., 1966 | FR | 427/7.
|
Primary Examiner: Bell; Janyce
Attorney, Agent or Firm: Mueller and Smith
Parent Case Text
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. application Ser. No.
07/263,058, filed Oct. 27, 1988, now abandoned which in turn is a
continuation-in-part of U.S. application Ser. No. 868,955, filed May 30,
1986, now U.S. Pat. No. 4,882,195 which in turn is a continuation-in-part
of U.S. application Ser. No. 857,929, filed Apr. 30, 1986, now abandoned,
the disclosures of which are expressly incorporated herein by reference.
Claims
I claim:
1. Method for labeling an object for identification which comprises the
steps of:
(a) preparing a substrate to contain a binder bearing an ultra-violet (UV)
radiation sensitive dye and an amino acid or protein fragment from the
hair of an individual;
(b) contacting a marker with said substrate; and
(c) applying said contacted marker to an object at a location thereupon to
create a permanent impression on said object, which impression is
perceptible only in the presence of UV radiation.
2. The method of claim 1 wherein said marker comprises a person's finger.
3. The method of claim 1 wherein said binder comprises a thermoplastic
resin or thermoset resin.
4. The method of claim 3 wherein said thermoplastic resin or thermoset
resin is selected from the group consisting of a polyester, a
polyurethane, an acrylic resin, an ethylene vinyl acetate copolymer, a
vinyl chloride homopolymer or copolymer, a styrene butadiene polymer, a
styrene acrylonitrile polymer, a silicone resin, a cellulosic resin, an
ionomer, an air-drying polyester, an epoxy resin, and mixtures thereof.
5. The method of claim 1 wherein said binder comprises a carrier effective
in establishing one or more of chemical or physical association of said
ultra-violet radiation sensitive dye with said object.
6. The method of claim 5 wherein said carrier comprises a vegetable oil.
Description
BACKGROUND OF THE INVENTION
The present invention relates to the labeling of objects for verifying
authenticity and me particularly to the use of a selectedly-perceptible
mark, such as a fingerprint, therefor.
Many objects require verification for authenticity. Such objects include
paintings, sculptures, and like works of art; video cassette recorders,
televisions, and like household objects; computers; printers, and like
office and business equipment; packages in which valuable objects need to
be authenticated and documented so that the owner knows that they are
genuine. This same knowledge also is required by an insurance company
prior to insuring a work of art. With respect to the authentication and
documentation of works of art, for example, a detailed and exhaustive
undertaking is required to be conducted by a recognized and bonded expert.
This procedure includes physical authentication utilizing detection
methods involving the use of infrared spectroscopy, X-ray radiography,
ultra-violet spectroscopy, raking light procedures, pigment analysis, and
like procedures. For a lithograph, for example, the lithograph must be
unframed and free of obstacles for inspection. A careful scrutiny of the
entire print back and front surface must be undertaken in order to detect
evidence of variations from perfection including tears or folds, bacterial
action, smudges, handprints, dirt, stains and like imperfections, which
originate both from the original printing and from later abrasion thereof.
Observation additionally must extend to the kind of base material used,
total count of colors and variations, and other variations from normal. It
will be observed that a qualified expert can undertake such an
examination.
Next, the historical information of the work of art must be considered. For
a painting, for example, the history of the painting must be recorded and
verified. This history includes where the painting came from, the date of
origin of the painting, all sales records and auction records of the
painting, diaries of the painting, and specific collector or museum
documentation which accompanies the painting.
Now, such procedure for authentication of works of art ordinarily is
required when the work of art is insured, when the art changes ownership,
and even when the work of art is placed on loan and then returned. It will
be observed that the recommended authentication procedure involves much
time and expense. Nevertheless, museums, owners of works of art, insurance
companies, and like interested parties must insist on such authentication
procedures for their own protection.
Other instances of identification include the ability to verify ownership
of more common objects such as household appliances, business equipment,
and like objects. Often, these objects have no serial number or other
unique means of identification, or the number can be removed easily
following a theft. Thus, a simple method for reliably identifying such
objects would be welcomed by the owners.
Still another field which requires verification of ownership involves
credit cards and checks, for example. Credit card theft amounts to
millions of dollars annually, yet detection of the unauthorized use use of
a credit card often is difficult or inconvenient for the store owner. The
same holds true for negotiable instruments like checks. Thus, there is a
substantial need for providing either a deterrent against those who would
improperly or illegally utilize credit cards or stolen checks, or for the
apprehension of such individuals following such unauthorized or illegal
use.
BROAD STATEMENT OF THE INVENTION
The present invention is addressed to providing a simple, yet reliable
method for labeling an object for its verification. Broadly, the method of
the present invention for leveling an object for its verification
comprises applying to a predetermined location on said object, a mark
which creates a permanent impression thereof which is perceptible only in
the presence of ultra-violet (UV) radiation. One embodiment of the present
invention comprises applying a selected person's fingerprint to the object
at a predetermined location upon said object. Next, the pre-determined
location is exposed to a vaporous agent comprising vapors of a
cyanoacrylate ester. Either the fingerprint or the cyanoacrylate ester
bears a detectable amount of an agent. The vaporous agent creates a
permanent impression of the fingerprint on the object, which impression is
imperceptible only to in the presence of selected wavelengths of energy by
virtue of said agent. Desirably, the agent is an ultra-violet radiation
sensitive compound or dye which is not visually perceptible except upon
application of ultra-violet (UV) radiation to the predetermined location.
Alternatively, a substrate can be prepared to contain a binder which bears
the UV sensitive agent. The substrate can be a pad bearing a reservoir of
the binder/UV agent or can be a tape having a transferrable film of the
binder/UV agent. Next, a marker or an imprinter, such as a selected
person's finger, is contacted with the substrate. Finally, the contacted
finger is applied to the object at a predetermined location thereupon to
crate a permanent impression of the fingerprint on the object, which
impression is perceptible only in the presence of UV radiation. For all
embodiments of the invention, a clear plastic laminate, for example,
optionally, can overlay the fingerprint location on the object.
As an augmentation to the UV determination of the permanent impression,
amino acids or protein fragments derived from the hair of a selected
individual, e.g. an artist for his painting, can be incorporated into the
formulation of binder and UV sensitive agent. A comparison of such amino
acid or protein fragments of a suspected stolen object then could be made
with a retained sample and authentication verified.
Advantageously, the object can be a work of art, such as painting or a
sculpture. Alternatively, the object may be a credit card receipt or
voucher utilized at the time that the credit card is used in making a
purchase. At such point of purchase, the object also may be a negotiable
instrument such as a check. In the latter two cases, the object is being
identified, but more importantly, perhaps so is the person utilizing the
credit card or the check. Under such circumstances, the method of the
present invention may become an effective deterrent against the
unauthorized use of credit cards and checks, which forms another aspect of
the present invention.
Advantages of the present invention include a simple, yet reliable means
for labeling objects for identification. Another advantage is that the
label is not perceptible to people absent the application of appropriate
wavelengths of energy such as UV radiation. Another advantage is that the
label can last for an almost indefinite period of time. These and other
advantages will become readily apparent to those skilled in the art based
upon the disclosure contained herein.
DETAILED DESCRIPTION OF THE INVENTION
Once an object is identified and verified, it can be labeled in accordance
with the inventive technique disclosed herein so that its authentication
at a later data is enhanced materially. Based upon the foregoing
description in the field of art verification, it can be appreciated that
art owners, insurance companies, and art experts can use all the
assistance which can be provided for them in properly identifying and
verifying the authenticity of works of art. The present invention provides
such assistance by providing an "invisible" label, the location of which
on the object is not published and is not apparent to the naked eye. Only
upon the application of selected wavelengths of energy at the right
location on the object is the fingerprint label perceptible. Paintings and
sculptures, for example, can be identified and authenticated initially
with the authentication procedure involving the application of a
fingerprint thereto. At a later date when the work of art needs to be
authenticated again, not only can the owner utilize the services of an art
expert in conjunction with the historical paperwork on the art, but the
observance of the fingerprint label will provide further evidence as to
the genuineness of the work of art being evaluated. That is, when a museum
loans a work of art, it will know that the work of art being returned is
the same work of art that was lent in the first instance.
By properly preserving the secrecy of the fingerprint labeling procedure,
the value of the fingerprint label is enhanced. That is, the location of
the fingerprint label can be controlled as well as whose fingerprint is
applied thereto. In fact, combinations of fingerprints can be utilized at
the same or at different locations on the object for providing further
fool-proof means for labeling the object. Since Dactyloscopy is a
recognized science by the courts, recognized experts for reading
fingerprints can be utilized for verifying the authenticity of the
fingerprint labels. As noted above, the fingerprint labeling technique of
the present invention can be utilized on any object. Objects as
common-place as television sets, video cassette recorders, and the like
can be identified by the fingerprint label technique of present invention.
Should such objects be stolen, the criminal would not be able to mask the
identity of the object by removing serial numbers applied by the
manufacturer. Indeed, the fingerprint label could be located at almost any
surface of the object so that its identity would be firmly established.
One useful technique for implementing the present invention involves the
application the fingerprint label to an object as described herein. Next,
a fluorescent light would be shined upon the surface whereat the
fingerprint is located and a record, e.g. photograph, of such surface and
fingerprint label taken. The photograph would document the exact placement
location of the fingerprint label. The photograph could be maintained
within the files of the company offering such fingerprint labeling
service. The likelihood of a fingerprint being placed in the same location
is remote, so that the fingerprint labeling technique of the present
invention is a near-foolproof technique for labeling objects for their
identification and verification. It will be appreciated that when the UV
light is turned off, the "invisible" mark again becomes invisible to the
observer. The mark can be rendered visible numerous times without
affecting it or its ability to remain invisible in the absence of the UV
light.
Moreover, the present invention can be implemented to even a further degree
of sophistication utilizing the new breed of "high tech" fingerprint
computer equipment which currently is being put into service by some law
enforcement agencies. This aspect of the invention involves the
maintenance of a duplicate copy of the fingerprint label applied to the
object either on a card which the owner of the object retains or company
offering such fingerprint labeling service retains it. If the labeled
object were stolen and recovered, or its authenticity questioned, the
fingerprint could be indentified. By cross-referencing the identified
fingerprint, the object, e.g. a piece of art, actually could be identified
and the true owner determined. This technique could be done through the
use of a single fingerprint classification and identification system that
currently exists within the law enforcement arena. Besides manual matching
of fingerprints, the use of fingerprint computer equipment also could be
implemented.
Another field which will benefit greatly by the fingerprint labeling
technique of the present invention in the credit card and negotiable
instrument field. Often, credit cards and checks (e.g. a negotiable
instrument) are stolen and improperly used. At the point of sale, the
sales clerk need only require the presenter of the credit card or check to
place a fingerprint upon a surface of the credit card receipt or voucher,
or upon the negotiable instrument itself, followed by exposure thereto
cyanoacrylate vapors, in order to be able to authenticate the credit card
purchase or negotiable instrument being presented for payment. It is not
likely that credit card or check thieves would be so ready to have their
fingerprint permanently attached to the credit card receipt or check which
leaves their possession and may eventually be presented to the police
should the transaction be improper. Thus, the fingerprint labeling
technique of the present invention should prove to be a deterrent against
the unauthorized use of credit cards and of stolen checks.
A further field which will benefit greatly by the fingerprint labeling
technique of the present invention is the travel field, particularly with
respect to the use of passports and visas by international travelers. The
use of forged or false passports is an ever-increasing problem which
customs officials at various international airports must deal with on a
daily basis. Besides matching the physical description on the passport to
the bearer thereof and the attempted verification of the genuineness of
the passport, the fingerprint labeling technique of the present invention
also could be utilized. Again, the passport would bear the non-removably
and "invisible" fingerprint of the true bearer which could be accomplished
at the issuance of the passport. Thereafter, the fingerprint of the bearer
could be matched to the fingerprint on the passport should questions as to
the authenticity of the passport be raised upon its presentation. An
advantage in using the fingerprint label of the present invention is the
near-impossibility of removing the fingerprint from the face of the
passport once it has been applied. While use of solvents or etching
techniques may result in removal of the fingerprint, likely destruction of
the surface of the passport would occur also. Such alteration, then would
be detectable by the customs agent inspecting the passport. Thus, an
effective technique for aiding customs officials in verifying the
authenticity of passports is yet another advantage of the present
invention.
Three techniques for practicing the present invention can be envisioned
readily. Two of the techniques involve the fuming of the object for its
labeling. One embodiment involves the use of a pad which bears the UV dye
along and wherein the fuming agent comprises the cyanoacrylate or other
binder. The second fuming technique involves the application of the
fingerprint to the object to be labeled followed by the fuming with the
binder and dye combination. The third technique involves a pad which
contains both the binder and the UV dye, which pad is contacted by the
finger and thereupon the fingerprint transferred to the object being
labeled. When speaking of "fingerprint", such fingerprint usage is
preferred since it is unique for each individual and is a convenient
manner for marking objects to be labeled for verification. In a broader
sense, the "label" applied to the object need only be a mark which creates
a permanent impression thereof which is preceptible only in the presence
of UV radiation. When a pad bears both the binder and UV dye, then any
convenient stamp or similar imprinting implement can be utilized to apply
a variety of forms of marks including a digitized code for fingerprints, a
person's Social Security or drivers license number, a person's birthday,
or any other series of numbers. For that matter, designs and logos can be
applied as a mark for creating a permanent impression thereof which is
preceptible only in the presence of UV radiation. The invention will be
described with particularity for utilizing fingerprints as the invisible
mark applied for labeling an object, though such description is by way of
illustration and not limitation of the present invention.
The fuming embodiments of the present invention most readily are associated
with alpha-cyanoacrylate binders, though other thermoplastic or thermoset
binders possibly could be adapted to such fuming technique. In the field
of Dactyloscopy, latent fingerprints have been developed with
cyanoacrylate esters as proposed in, for example, U.S. Pat. Nos.
3,523,628, 3,678,014, 4,103,081, 4,297,383, 4,407,842, and 4,461,235. In
fact, a much improved cyanoacrylate ester aerosol spray method is
disclosed in commonly-assigned application Ser. No. 849,380, filed Apr. 8,
1986. These proposals operate upon the apparent attraction of
cyanoacrylate esters for amino acids and riboflavins secreted through the
human skin and present in latex fingerprints. The result of the contact of
vapors of cyanoacrylate with the latent fingerprint is a physical
impression of the fingerprint that can be conventionally "lifted" by law
enforcement personnel utilizing carbon dust, magnetic powder, talc, or the
like techniques. Location of the fingerprints often is assisted by
inclusion of a UV dye in the cyanoacrylate vapors which causes the
developed latent fingerprints to fluoresce under the influence of UV
radiation. Common in these prior proposals is the use of cyanoacrylate
ester vapors for the detection of latent fingerprints so that the
individual leaving the latent fingerprints can be identified. Most
certainly this use of latent fingerprints detection is associated with
crime and the apprehension of criminals. The present invention is unique
in its adaptation of cyanoacrylate development of latent fingerprints to
uses far afield from the identification of criminals through the use of
latent fingerprints. Indeed, the method of the present invention involves
the application of such cyanoacrylate latent fingerprint technology to the
labeling of objects for verifying their authenticity.
As noted above, several prior proposals deal with the cyanoacrylate
development of latent fingerprints. While any of those techniques can be
used for implementation of the present invention, preferably, the
cyanoacrylate ester aerosol spray method of Ser. No. 849,380 is utilized.
The utilization of an aerosol container of cyanoacrylate ester has many
advantages with respect to the application of the cyanoacrylate vapors to
an object being fumed for the fixation of a fingerprint label. It may be
desirable to include a UV dye in the cyanoacrylate ester itself as
proposed in said co-pending application. Alternatively, for works of art,
it may be preferred that the finger or thumb of the person whose print is
being affixed to the object be contacted with a pad or cloth containing
the UV dye so that the latent fingerprint applied to the object, rather
than the cyanoacrylate ester itself, contains the UV dye. The exposure of
such a UV-impregnated fingerprint to vapors of cyanoacrylate ester still
ersult in a fixed, permanent fingerprint which fluoresces in the presence
of UV radiation. Also, this embodiment of the present invention does not
expose sensitive areas of the object to air-borne UV dye which may damage
the work of art itself.
Alkyl esters of alpha-cyanoacrylates are known in the art. Typically, the
alkyl ester group will be a C.sub.1 -C.sub.6 group, and preferably a
C.sub.1 -C.sub.3 alkyl group (e.g. a mixture of methoxyethyl cyanoacrylate
and ethoxyethyl cyanoacrylate). In utilizing the preferred aerosol spray
method, a halogenated organic solvent is included in the container which
solvent is inert with respect to the cyanoacrylate, has a low boiling
point (e.g. about 167.degree. F.) and desirably is non-flammable for
safety purposes. Halogenated organic solvents which meet this diverse
criteria include, for example, the low-boiling point chlorinated
hydrocarbons or fluorocarbons, chloro-fluorocarbons, or mixtures thereof.
These solvents additionally should not be deleterious to or damage the
objects being exposed to the cyanoacrylate vapors. Preferred halogenated
organic solvents are di-chloro fluoromethane, di-chloro
tetra-fluoroethane, tri-chloroethane, tri-chloro fluoromethane, and the
like and mixtures thereof. The cyanoacrylate ester spray method utilizes
the mixture of cyanoacrylate and halogenated organic solvent which
normally ranges from between about 1 and 99 percent by weight
cyanoacrylate and advantageously this proportion is between about 1 and 10
percent by weight. The concentration the mixture in the organic propellant
often ranges from between about 50 to 60 percent by weight. The
cyanoacrylate proportion, of course, can vary depending upon the type of
cyanoacrylate, type of solvent, type of propellant, pressure of the
contents in the container, orifice size, and like factors taught in the
cited copending application. Preferred propellants are from the methane
gas series and include, for example, ethane, propane, butane, pentane, and
their halogenated derivatives (e.g. mono-fluoroethane, mono-chloroethane,
etc.) and the like and even mixtures thereof.
While the object to be fumed can be placed in a small room or like confined
area for exposure to the cyanoacrylate ester vapors, preferably, a vapor
tank specially constructed for such purpose is utilized. Such tanks have
been proposed in the art. The preferred such tank is disclosed in
commonly-assigned U.S. Pat. No. 4,700,657. Such vapor tank, or a smaller
or larger version thereof, advantageously can be utilized with the
fingerprint labeling technique of the present invention. For credit card
receipts and checks, for example, a smaller version which can be utilized
at the point of sale in various stores is used to fume such small objects
at the time the sale is made. The preferred vapor tank utilizes the
preferred aerosol spray method which makes the fingerprint labeling
operation extremely simple to utilize at the time that the sale is being
made. In fact, only a matter of seconds or minutes are involved in the
fixation of the applied fingerprint to the object. Should the person
presenting the credit card or check refuse to have the fingerprint fixed,
the sales clerk would be immediately alerted to the possibility of an
anauthorized use taking place. The credit card or check can be confiscated
immediately and appropriate security personnel notified.
While the cyanoacrylate fuming procedure described above is quite
efficacious, on some occasions, it would be more convenient to adapt such
fuming system to eliminate the fuming, yet still achieve transfer of the
invisible fingerprint to the object to be labeled. A convenient method for
accomplishing this involves the contact of the person's finger with a pad
which bears the UV dye, which finger can then be contacted at the
predetermined location on the object. For permanence in accordance with
the present invention, the pad would bear the cyanoacrylate dissolved in a
solvent along with the UV dye. While such embodiment is functional, the
reactivity of the cyanoacrylate ester minimizes the convenience of this
alternative procedure. Accordingly, when it is desired to use a pad
bearing the UV dye, yet retain the invisible and permanence aspects of the
present invention, the pad should contain a binder which bears the UV
sensitive dye. Appropriate binders comprise hardenable materials,
including, for example, thermoplastic resins. Thermoset resins, and
penetrating carriers effective in establishing chemical and/or physical
association of the UV dye with the surface of the object being labeled.
Thermoplastic resins include, for example, polyesters, urethanes,
acrylics, ethylene vinyl acetate copolymers, vinyl chloride homopolymers
and copolymers, styrene butadiene polymers, styrene acrylonitrile
polymers, silicone resins, cellulosic resins, ionomers, and the like and
mixtures thereof. Thermosetting materials include, for example, air drying
polyesters, urethane-forming resins formulated from polyols and
polyisocyanates, conventional two-component epoxy resins with conventional
hardeners (e.g. polyamine resins), UV curable resins, moisture-curable
urethane resins, enzyme-curable resins, electron beam curable resins,
radio-frequency curable resins, and the like, and mixtures thereof. So
long as the binder, optionally with a solvent, can retain the UV dye, and
provide permanence to the fingerprint on the object being labeled, such
binder is suitable for use in accordance with the precepts of the present
invention.
For present purposes, "permanent" as applied to the fingerprint label on
the object means that the fingerprint is incapable of being removed from
the object in the ordinary course of intended handling and usage of the
object for a time adequate for identification and/or verification of the
object to occur. For some objects, it may be desirable that the
fingerprint label remain affixed to the object and identifiable in
presence of UV radiation for many years. Such objects would include works
of art, household appliances, machinery, automobiles, automobile parts,
and the like. Some objects, however, require identification and/or
verification only for a limited period of time. Credit card receipts would
be one such example wherein a limited time period would apply. In this
regard, once the purchase has been confirmed by the holder of the credit
card, for example, the validated transaction no longer requires that the
paper copy of the credit card receipt retain the fingerprint label. Thus,
such a label need only be "permanent" for a limited period of time, say
several weeks to several months.
Continuing with the description of thermoplastic and thermoset resins,
specific examples include, for example, latex copolymers including methyl
methacrylate/ethyl acrylate copolymers, styrene/butyl acrylate copolymers,
styrene/butadiene copolymers, styrene/butyl acrylate/methacrylic
acid/acrylic acid copolymers, methyl methacrylate/methacrylic acid/ethyl
acrylate copolymers, methacrylic acid/butadiene/styrene copolymers, methyl
methacrylate/butyl acrylate copolymers, butadiene/methacrylic acid
copolymers, butadiene/acrylonitrile/methacrylic acid copolymers,
butadiene/acrylonitrile/methacrylic acid copolymers, methacrylic
acid/methyl methacrylate/ethyl acrylate/acrylic acid/ethyl acrylate
copolymers; tongue oil/fumeric acid/pentaerythritol copolymers, and the
like and mixtures thereof. Thus, it will be observed that a wide variety
of thermoplastic and thermoset materials are suitable for use in
accordance with the precepts of the present invention.
Penetrating carriers which are effective in establishing chemical and/or
physical association of the UV dye with the surface of the object being
labeled may be termed as solvents, which optionally may be reactive, e.g.
UV curable acrylic monomers. Alternatively, for some substrates, such as
paper or plastic, a vegetable oil or other carrier may be effective in
penetrating into the substrate and carry the UV dye along with it. Whether
the vegetable oil or other solvent remains or evaporates does no matter so
long as the UV dye in the form of the fingerprint remains firmly
established or permanent for the requisite time appropriate for the object
being labeled. Of course, the label also should not be readily perceptible
to the human eye without the aid of UV radiation. Finally, magnetizable
particles can be applied to the formulation and the permanently applied
mark detected thereby, e.g. using a U.S. Bank Notes IC Detector, No. 1175N
(John Manufacturing Ltd., Kawloon, Hong Kong).
The substrate which bears the binder/UV sensitive agent combination can be
a simple porcelain, rubber, fabric, or like pad which retains the material
therein. Alternatively, a quite unique embodiment of the present invention
involves the formation of a film of the binder/UV dye combination which is
drawn down on a film, e.g. a cellulosic film or polymeric film such as a
polyethylene terephthalate film (marketed under the trademark Mylar, E.I.
Du Pont de Nemours and Company). A second, release film then is overlaid
the film in conventional fashion. The thus-formed laminate structure can
be in the form of a roll of tape for convenient usage of it. When the
transfer of the fingerprint is desired, the tape need only be unrolled and
an appropriate amount cut off. The two substrates then are parted to leave
exposed one of the substrates which still bears a film of the binder/UV
agent combination. A person then need only contact such film with a finger
or thumb and then apply the contacted finger or thumb to the object being
labeled. The spent substrate then conveniently can be disposed in an
appropriate receptacle. A convenient, inexpensive, and disposable
fingerprint identification system has been revealed.
Fluorescent dyes which may be utilized in the container bearing the
cyanoacrylate ester or which may be contained in a gauze or pad
impregnated therewith, include those fluorescent dyes conventionally
proposed in the art in the latent fingerprint detection field. These
fluorescent dyes include, for example, various rhodamines, such as
Columbia Blue, 8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium salt
(HOPSA, Eastman Chemical Company), Rhodamine B, or Hostacell yellow 8G
(American Hoechst Corporation). The ultra-violet source exposes the
fingerprint labels when shined on the object at the appropriate location
where the fingerprint label is located.
As a further and/or alternative means of identification, especially when an
artist is involved, involves cutting a lock of hair from the artist,
digesting it with appropriate enzymes or chemicals to produce either free
amino acids, protein fragments, or combinations thereof, and incorporate
this "soup" into the marking fluid disclosed herein. Detection, then,
would involve dissolving the marking fluid from the suspected forgery,
purifying it for high pressure liquid chromatography (HPLC) analysis,
separating the amino acids or protein fragments (if any) on a
chromatographic column, and then comparing it to a reference standard
prepared from the artist from his hair. The mark is "permanent" as
described herein, can be located by virtue of the presence of the UV agent
which provides one means for identification, followed by the amino
acid/protein fragment comparison that would unquestionably authenticate
the object.
It will be observed that the present invention has apparent utility in a
wide variety of fields beyond those described herein. The disclosure
herein illustrates the presently-known preferred embodiments for utilizing
the fingerprint labeling technique of the present invention. It will be
readily apparent to those skilled in the art that a wide variety of other
objects may be suitably labeled in accordance with the precepts of the
present invention for their identification. Such additional objects and
circumstances are included within the scope of the present invention in
accordance with the precepts thereof. All citations cited herein are
incorporated expressly herein by reference. The following examples show
how the present invention has been practices but should not be construed
as limiting.
EXAMPLES
Example
An acrylic latex (43 parts styrene/45 parts ethyl acrylate/12 parts hydroxy
ethyl acrylate) at 50% solids in water was mixed with a UV fluorescent dye
(fluorescein) and poured onto a sponge contained in a glass dish. Touching
the sponge with the finger of one's hand followed by application of the
finger to metal, glass, or wood resulted in the reproduction of a polymer
film structure which was an exact replication of the fingerprint of the
person who contacted the sponge. Upon drying of the polymer film
(evaporation of the solvent), a rigid and durable (good adhesion)
fingerprint structure formed. This fingerprint structure was not visible
to the unaided eye, though was readily perceptible when a UV light source
was shined upon it.
Example 2
The same acrylic latex/dye system of Example 1 was applied as a thin film
between two sheets of Mylar material (Mylar brand polyethylene
terephthalate film, E.I. Du Pont de Nemours and Company). This laminate
structure was stable for several months in that the film remained soft and
pliable during the storage time period. Removal of the top Mylar film
structure exposed the latex/dye film layer which then was contacted with a
person's finger to effect film transfer. The person's finger then
retransferred the latex/dye material to several solid objects, including
metal, glass, and wood. This second transfer process replicated the
fingerprint which became durable or permanent upon exposure to air, yet
was invisible to the naked eye absent the presence of UV light.
Example 3
The formulation comprised a methylmethacrylate-based acrylic latex (Rhoplex
AC-64, 60-61% solids, pH 9-9.5, viscosity 600 cps, density 8.8-8.9 lb/gal,
sp. gr. 1.06 g/cc, Rohm and Haas Co.) containing Columbia Blue or HOPSA
fluorescing agents (about 0.2 wt-%). Both formulations dried to
non-visible marks with fingerprints and a conventional office-type stamp
on paper, wood, and other surfaces. The mark became visible under a U.V.
light source. Another suitable resin system used was P & L 38/Statin H17
formulation (a soya-based alkyd, Pratt and Lambert Paint Co.).
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